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rules.go
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rules.go
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package rules
import (
"fmt"
"strconv"
"strings"
)
type IPTablesRule []string
func AppendComment(rule IPTablesRule, comment string) IPTablesRule {
comment = strings.Replace(comment, " ", "_", -1)
return IPTablesRule(
append(rule, "-m", "comment", "--comment", comment),
)
}
func NewMarkAllowRule(destinationIP, protocol string, port int, tag string, sourceAppGUID, destinationAppGUID string) IPTablesRule {
return AppendComment(IPTablesRule{
"-d", destinationIP,
"-p", protocol,
"--dport", strconv.Itoa(port),
"-m", "mark", "--mark", fmt.Sprintf("0x%s", tag),
"--jump", "ACCEPT",
}, fmt.Sprintf("src:%s_dst:%s", sourceAppGUID, destinationAppGUID))
}
func NewMarkLogRule(destinationIP, protocol string, port int, tag string, destinationAppGUID string) IPTablesRule {
return IPTablesRule{
"-d", destinationIP,
"-p", protocol,
"--dport", strconv.Itoa(port),
"-m", "mark", "--mark", fmt.Sprintf("0x%s", tag),
"-m", "limit", "--limit", "2/min",
"--jump", "LOG", "--log-prefix",
fmt.Sprintf(`"OK_%s_%s"`, tag, destinationAppGUID)}
}
func NewMarkSetRule(sourceIP, tag, appGUID string) IPTablesRule {
return AppendComment(IPTablesRule{
"--source", sourceIP,
"--jump", "MARK", "--set-xmark", fmt.Sprintf("0x%s", tag),
}, fmt.Sprintf("src:%s", appGUID))
}
func NewDefaultEgressRule(localSubnet, overlayNetwork string) IPTablesRule {
return IPTablesRule{
"--source", localSubnet,
"!", "-d", overlayNetwork,
"--jump", "MASQUERADE",
}
}
func NewLogRule(rule IPTablesRule, name string) IPTablesRule {
return IPTablesRule(append(
rule, "-m", "limit", "--limit", "2/min",
"--jump", "LOG",
"--log-prefix", name,
))
}
func NewAcceptExistingLocalRule() IPTablesRule {
return IPTablesRule{
"-i", "cni-flannel0",
"-m", "state", "--state", "ESTABLISHED,RELATED",
"--jump", "ACCEPT",
}
}
func NewLogLocalRejectRule(localSubnet string) IPTablesRule {
return NewLogRule(
IPTablesRule{
"-i", "cni-flannel0",
"-s", localSubnet,
"-d", localSubnet,
},
"REJECT_LOCAL: ",
)
}
func NewDefaultDenyLocalRule(localSubnet string) IPTablesRule {
return IPTablesRule{
"-i", "cni-flannel0",
"--source", localSubnet,
"-d", localSubnet,
"--jump", "REJECT",
}
}
func NewAcceptExistingRemoteRule(vni int) IPTablesRule {
return IPTablesRule{
"-i", fmt.Sprintf("flannel.%d", vni),
"-m", "state", "--state", "ESTABLISHED,RELATED",
"--jump", "ACCEPT",
}
}
func NewLogRemoteRejectRule(vni int) IPTablesRule {
return NewLogRule(
[]string{"-i", fmt.Sprintf("flannel.%d", vni)},
"REJECT_REMOTE: ",
)
}
func NewDefaultDenyRemoteRule(vni int) IPTablesRule {
return IPTablesRule{
"-i", fmt.Sprintf("flannel.%d", vni),
"--jump", "REJECT",
}
}
func NewNetOutRule(containerIP, startIP, endIP string) IPTablesRule {
return IPTablesRule{
"--source", containerIP,
"-m", "iprange",
"--dst-range", fmt.Sprintf("%s-%s", startIP, endIP),
"--jump", "RETURN",
}
}
func NewNetOutWithPortsRule(containerIP, startIP, endIP string, startPort, endPort int, protocol string) IPTablesRule {
return IPTablesRule{
"--source", containerIP,
"-m", "iprange",
"-p", protocol,
"--dst-range", fmt.Sprintf("%s-%s", startIP, endIP),
"-m", protocol,
"--destination-port", fmt.Sprintf("%d:%d", startPort, endPort),
"--jump", "RETURN",
}
}
func NewNetOutLogRule(containerIP, startIP, endIP, chain string) IPTablesRule {
return IPTablesRule{
"--source", containerIP,
"-m", "iprange",
"--dst-range", fmt.Sprintf("%s-%s", startIP, endIP),
"-g", chain,
}
}
func NewNetOutWithPortsLogRule(containerIP, startIP, endIP string, startPort, endPort int, protocol, chain string) IPTablesRule {
return IPTablesRule{
"--source", containerIP,
"-m", "iprange",
"-p", protocol,
"--dst-range", fmt.Sprintf("%s-%s", startIP, endIP),
"-m", protocol,
"--destination-port", fmt.Sprintf("%d:%d", startPort, endPort),
"-g", chain,
}
}
func NewNetOutDefaultLogRule(prefix string) IPTablesRule {
return IPTablesRule{
"-p", "tcp",
"-m", "conntrack", "--ctstate", "INVALID,NEW,UNTRACKED",
"-j", "LOG", "--log-prefix", prefix,
}
}
func NewReturnRule() IPTablesRule {
return IPTablesRule{
"--jump", "RETURN",
}
}
func NewInputRelatedEstablishedRule(subnet string) IPTablesRule {
return IPTablesRule{
"-s", subnet,
"-m", "state", "--state", "RELATED,ESTABLISHED",
"--jump", "RETURN",
}
}
func NewInputDefaultRejectRule(subnet string) IPTablesRule {
return IPTablesRule{
"-s", subnet,
"--jump", "REJECT",
"--reject-with", "icmp-port-unreachable",
}
}
func NewNetOutRelatedEstablishedRule(subnet, overlayNetwork string) IPTablesRule {
return IPTablesRule{
"-s", subnet,
"!", "-d", overlayNetwork,
"-m", "state", "--state", "RELATED,ESTABLISHED",
"--jump", "RETURN",
}
}
func NewNetOutDefaultRejectRule(subnet, overlayNetwork string) IPTablesRule {
return IPTablesRule{
"-s", subnet,
"!", "-d", overlayNetwork,
"--jump", "REJECT",
"--reject-with", "icmp-port-unreachable",
}
}